    var map;
    var markers = [];
    var infoWindow;
    var locationSelect;

    function load() {
   
	  var iZoom = parseInt(document.getElementById("zoom").value);
	  var iLat = parseInt(document.getElementById("lat").value);
	  var iLong = parseInt(document.getElementById("long").value);
 
	  map = new google.maps.Map(document.getElementById("map"), {
		center: new google.maps.LatLng(iLat, iLong),
		zoom: iZoom,
		mapTypeId: 'roadmap',
		mapTypeControlOptions: {style: google.maps.MapTypeControlStyle.DROPDOWN_MENU}
	  });
	  infoWindow = new google.maps.InfoWindow();
 
      locationSelect = document.getElementById("locationSelect");
      locationSelect.onchange = function() {
        var markerNum = locationSelect.options[locationSelect.selectedIndex].value;
        if (markerNum != "none"){
          google.maps.event.trigger(markers[markerNum], 'click');
        }
      };
   }

   function searchLocations(sBaseUrl) {
     var address = document.getElementById("addressInput").value;
     var geocoder = new google.maps.Geocoder();
     geocoder.geocode({address: address}, function(results, status) {
       if (status == google.maps.GeocoderStatus.OK) {
        searchLocationsNear(sBaseUrl, results[0].geometry.location);
       } else {
         //alert(address + ' not found');
       }
     });
   }

   function clearLocations() {
     infoWindow.close();
     for (var i = 0; i < markers.length; i++) {
       markers[i].setMap(null);
     }
     markers.length = 0;

     locationSelect.innerHTML = "";
     var option = document.createElement("option");
     option.value = "none";
     option.innerHTML = "See all results:";
     locationSelect.appendChild(option);
   }

   function searchLocationsNear(sBaseUrl, center) {
     clearLocations(); 
     
	 var item = document.getElementById('itemSelect').value;  
     var radius = document.getElementById('radiusSelect').value;  
	 var lat = center.lat();
	 var lng = center.lng();
      
     var searchUrl = sBaseUrl+'map_multiple/'+item+'/'+lat+'/'+lng+'/'+radius;
	 
	 downloadUrl(searchUrl, function(data) {
       var xml = parseXml(data);
       var markerNodes = xml.documentElement.getElementsByTagName("marker");
       var bounds = new google.maps.LatLngBounds();
       
		if (markerNodes.length == 0) {
		   map.setCenter(center);
		   map.setZoom(11);
		} else { 	   
		   for (var i = 0; i < markerNodes.length; i++) {
 
			 var name = markerNodes[i].getAttribute("name");
			 var address = markerNodes[i].getAttribute("address");
			 var url = markerNodes[i].getAttribute("url"); 
			 var distance = parseFloat(markerNodes[i].getAttribute("distance"));
			 var latlng = new google.maps.LatLng(
				  parseFloat(markerNodes[i].getAttribute("lat")),
				  parseFloat(markerNodes[i].getAttribute("lng")));

			 createOption(name, distance, i);
			 createMarker(latlng, name, address, url);
			 bounds.extend(latlng);
		   }
		   map.fitBounds(bounds);
	   }

       locationSelect.style.visibility = "visible";
       locationSelect.onchange = function() {
         var markerNum = locationSelect.options[locationSelect.selectedIndex].value;
         google.maps.event.trigger(markers[markerNum], 'click');
       };
      });
    }

    function createMarker(latlng, name, address, url) {
 
	  var html = "<b><a href='"+ url +"'>" + name + "</a> </b> <br/>" + address;
 
      var marker = new google.maps.Marker({
        map: map,
        position: latlng
      });
      google.maps.event.addListener(marker, 'click', function() {
        infoWindow.setContent(html);
        infoWindow.open(map, marker);
      });
      markers.push(marker);
    }

    function createOption(name, distance, num) {
      var option = document.createElement("option");
      option.value = num;
      option.innerHTML = name + "(" + distance.toFixed(1) + ")";
      locationSelect.appendChild(option);
    }

    function downloadUrl(url, callback) {
      var request = window.ActiveXObject ?
          new ActiveXObject('Microsoft.XMLHTTP') :
          new XMLHttpRequest;

      request.onreadystatechange = function() {
        if (request.readyState == 4) {
          request.onreadystatechange = doNothing;
          callback(request.responseText, request.status);
        }
      };

      request.open('GET', url, true);
      request.send(null);
    }

    function parseXml(str) {
      if (window.ActiveXObject) {
        var doc = new ActiveXObject('Microsoft.XMLDOM');
        doc.loadXML(str);
        return doc;
      } else if (window.DOMParser) {
        return (new DOMParser).parseFromString(str, 'text/xml');
      }
    }

    function doNothing() {}